现象之间的相关程度越低，则相关系数越（）。
A.接近+1
B.接近-1
C.接近0
参考答案：C
The 21st Century Fox has produced _____ it did last year. [ ]
A. twice more movies as
B. twice as much movies as
C. twice as many movies as
D. as twice movies as
生产经营单位与从业人员订立协议，免除或者减轻其对从业人员因生产安全事故伤亡依法应承担的责任的，该协议（）
A.效力待定
B.无法确定
C.无效
D.可撤销
